DiagrammeR (version 1.0.11)

add_path: Add a path of nodes to the graph

Description

With a graph object of class dgr_graph, add a node path to the graph.

Usage

add_path(
  graph,
  n,
  type = NULL,
  label = TRUE,
  rel = NULL,
  node_aes = NULL,
  edge_aes = NULL,
  node_data = NULL,
  edge_data = NULL
)

Value

A graph object of class dgr_graph.

Arguments

graph

A graph object of class dgr_graph.

n

The number of nodes comprising the path.

type

An optional string that describes the entity type for the nodes to be added.

label

Either a vector object of length n that provides optional labels for the new nodes, or, a logical value where setting to TRUE ascribes node IDs to the label and FALSE yields a blank label.

rel

An optional string for providing a relationship label to all new edges created in the node path.

node_aes

An optional list of named vectors comprising node aesthetic attributes. The helper function node_aes() is strongly recommended for use here as it contains arguments for each of the accepted node aesthetic attributes (e.g., shape, style, color, fillcolor).

edge_aes

An optional list of named vectors comprising edge aesthetic attributes. The helper function edge_aes() is strongly recommended for use here as it contains arguments for each of the accepted edge aesthetic attributes (e.g., shape, style, penwidth, color).

node_data

An optional list of named vectors comprising node data attributes. The helper function node_data() is strongly recommended for use here as it helps bind data specifically to the created nodes.

edge_data

An optional list of named vectors comprising edge data attributes. The helper function edge_data() is strongly recommended for use here as it helps bind data specifically to the created edges.

Examples

# Create a new graph and add
# 2 paths of varying lengths
graph <-
  create_graph() %>%
  add_path(
    n = 4,
    type = "path") %>%
  add_path(
    n = 5,
    type = "path")

# Get node information
# from this graph
graph %>% get_node_info()

# Node and edge aesthetic and data
# attributes can be specified in
# the `node_aes`, `edge_aes`,
# `node_data`, and `edge_data`
# arguments

suppressWarnings(RNGversion("3.5.0"))
set.seed(23)

graph_w_attrs <-
  create_graph() %>%
  add_path(
    n = 3,
    label = c(
      "one", "two", "three"),
    type = c(
      "a", "a", "b"),
    rel = "A",
    node_aes = node_aes(
      fillcolor = "steelblue"),
    edge_aes = edge_aes(
      color = "red",
      penwidth = 1.2),
    node_data = node_data(
      value = c(
        1.6, 2.8, 3.4)),
    edge_data = edge_data(
      value =
        rnorm(
          n = 2,
          mean = 5.0,
          sd = 1.0)))

# Get the graph's node data frame
graph_w_attrs %>% get_node_df()

# Get the graph's edge data frame
graph_w_attrs %>% get_edge_df()